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Balance Sheet Accounts - Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Insurance | $ 1,247 | $ 221
Clinical trial costs | 996 | 95
Professional fees | 72 | 49
Other | 3 | 30
Prepaid expenses and other current assets | $ 2,318 | $ 395

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